EVENT 101 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 2 | Tom Derbyshire | 15 | StaffordApex | 4:17.02 |
| 4 | 4 | Regan Lloyd | 16 | teamipswich | 4:13.66 |
| 5 | 3 | Thomas Diaper-Fox | 16 | Co South'ton | 4:17.11 |
| 6 | 1 | James Row | 16 | Newburn | 4:16.94 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 6 | Jack Baister | 16 | Middlesboro | 4:14.42 |
| 1 | 8 | Thomas Flaherty | 16 | Co Milton K | 4:13.24 |
| 2 | 10 | Samuel Budd | 15 | Co Sheffield | 4:16.30 |
| 3 | 12 | Jarvis Parkinson | 15 | Donc Dartes | 4:10.60 |
| 4 | 14 | Julian Chan Quee Lin | 16 | Dulwich Dolp | 4:06.64 |
| 5 | 13 | Paul Hentschel | 16 | SC Chemnitz | 4:08.82 |
| 6 | 11 | Cameron Kurle | 16 | Millfield | 4:15.69 |
| 7 | 9 | Mark Ovington | 16 | Chester Le S | 4:14.86 |
| 8 | 7 | Samuel Richards | 16 | Co Coventry | 4:09.44 |
| 9 | 5 | David Richardson | 16 | Warrington W | 4:12.56 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 18 | Bradley Lynch | 17 | Co Birm'ham | 4:01.61 |
| 1 | 24 | Caleb Hughes | 18 | Hatfield | 3:56.87 |
| 2 | 30 | Max Litchfield | 18 | Donc Dartes | 3:56.25 |
| 3 | 36 | Gareth Mills | 20 | Co Leeds | 3:58.85 |
| 4 | 42 | Matthew Johnson | 18 | Co Sheffield | 3:54.73 |
| 5 | 39 | Dion Dreesens | 20 | NED | 4:02.41 |
| 6 | 33 | Daniel Coombs | 25 | Stockport Mo | 4:03.86 |
| 7 | 27 | Alex Dunk | 18 | Prescot | 4:00.23 |
| 8 | 21 | Daniel Skaaning | 20 | DEN | 4:00.88 |
| 9 | 15 | Suleman Butt | 16 | Aberdeen | 4:08.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 19 | Matthew Sleight | 18 | KingstonHull | 4:08.07 |
| 1 | 25 | Oliver Tennant | 20 | Swim Swansea | 3:59.51 |
| 2 | 31 | Thomas Allen | 21 | Swansea Uni | 4:00.22 |
| 3 | 37 | Alfie Howes | 21 | Bath Univ | 3:59.04 |
| 4 | 43 | Ieuan Lloyd | 20 | Co Cardiff | 3:54.69 |
| 5 | 40 | James Guy | 18 | Millfield | 3:54.63 |
| 6 | 34 | Ferry Weertman | 21 | NED | 3:54.40 |
| 7 | 28 | Thomas Moss | 19 | Stockport Mo | 4:05.11 |
| 8 | 22 | Martin Cremin | 22 | StirlingSwim | 4:04.14 |
| 9 | 16 | Joel Knight | 18 | Millfield | 4:03.25 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Ross Douglas | 24 | Hamilton UAE | 4:09.95 |
| 1 | 26 | Nicholas Grainger | 19 | Co Sheffield | 3:58.18 |
| 2 | 32 | Joshua Walsh | 22 | Blackburn | 3:59.28 |
| 3 | 38 | Lewis Smith | 25 | Warrender Ba | 3:59.90 |
| 4 | 44 | Robert Renwick | 25 | Co Glasgow | 3:55.25 |
| 5 | 41 | Thomas Sunter | 21 | Co Sheffield | 3:55.57 |
| 6 | 35 | Stephen Milne | 19 | Perth City | 3:58.14 |
| 7 | 29 | James Gibson | 22 | Stockport Mo | 4:00.74 |
| 8 | 23 | Daniel Crosby | 19 | Stockport Mo | 4:01.32 |
| 9 | 17 | Joseph Poynter | 18 | Millfield | 4:04.94 |